And mixing machine



P. PFL'EID'ERER.

KNEADING AND MIXING MACHINE. No. 25L042 Patented Feb. 21,1882.

UNIT D STATES PATENT OFFICE,

KNEADING AND MIXING MACHINE.

SPECIFICATION forming part of Letters Patent N 0. 254,042, datedFebruary 21, 1882. Application filed February 16, 1880. Patented inEngland December 31, 1878, in France June 28, 1879, in Belgium July 7,187:], in

Austria Novtmber 11, 1879, in Italy January 31, 1880,

To all whom it may concern:

Be it known that 1, PAUL Norwood, in the county of Surrey, England, haveinvented a. certain new and useful Improvement in Kneading and MixingMachines, of which the following is a specification.

I My invention relates to machines of thekind described in LettersPatent of the United States, No. 180,568, granted August 1, 1876, toPaul Freyburger, and assigned to me.

In such machines the kneading or mixing is done by two rotary blades ofelliptical shape arranged obliquely or diagonally to their axes and theobject of my invention is to afford greater facility for the clearanceof the blades to diminish'strains due to the outward pressure of thematerial, especially when it is of a thick and heavy character, and atthe same time to obtain a more thorough kneading.

To this end my inventionconsists in the combination, with a trough orcase, of blades adapted to rotate therein, and composed of elliptical orellipse-like disks set obliquely to their axes of rotation, and havinggaps in their perimeters, which afford facility for the clearance ofmaterial and contribute to the thoroughness of the kneading operation.

In the accompanyingdrawings, Figure 1 represents a plan of a machineembodying myinvention, and Figs. 2, 3, and at represent differentconstructions of blades which may be employed, and all of which embodymy invention.

Similar letters of reference designate correspondin g parts in all thefigures.

Referring first to Fig. A designates the trough or case of the machine,which may be made of cast metal, and is provided in opposite sides withjournal-bearin gs to. These bearings may be formed between the upper andlower parts of the trough or case, and partly in each, the caps of thebearings being formed by the top part.

B designates the mixer shafts or spindles, which fit in the bearings a,and are geared to gether by wheels B, sothat both spindles will rotatein unison, but at difierentspeeds.

C designates the mixing-blades, which are PFLEIDERER, of

and in Germany August 13, 1880.

here represented as cast with'their shafts or spindles B, they beingunited therewith by arms I) at each end of the blade. The arms b travelclose to the sides of the trough or case, and form scrapers to free thesides from dough or other material adheringto them. The blades 0 are ofelliptical or ellipse-like form, and are oblique to the axes of theshafts B. In the drawings one of the blades is represented in face view,showing its form, while the other is in edge view, showing itsobliquity.

In the perimeter of the blades are formed gaps c, which may be formed incasting the blades, and these gaps form spaces, which afford clearancefor the material under operation and enable it to be more especiallywhere it is very stiff.

The blade 0, shown in Fig. 2, is like those just described, except thatit is made separate from its shaft. It has the same gaps c and arms b,and the shaft is intended to be inserted through holes (I in the armsI), and a hole, d, in the blade.

The blade (3 shown in Fig.3 is cast with its shaft B, and has the gaps0, but the blade is connected with its shaft directly,instead of by armsb. o

The blade 0 shown in Fig. 4 is like that shown in Fig. 3, except thatinstead of being cast with its shaft it is cast with a sleeve or hub, 0,through which the shaft is to be inserted. I

It will be observed that all the blades herein shown have the gaps c intheir perimeters, and no other openings through which material can pass.

easily worked,

What I claim as my invention, and desire to secure by Letters Patent,is-

The combination, in a kneadingmachine, with a trough or case, of bladesadapted to rotate therein, and composed of elliptical or ellipse-likedisks set obliquely to their axes of rotation and having gaps c in theirperimeters, substantially as specified.

PAUL PFLEIDERER.

Witnesses WILLIAM SPENoE, FRANK REDMAN.

